the doppler effect

what is the definition of the doppler effect?

the change in wavelength and frequency of the waves from a moving source due to the motion of the source towards or away from the observer

if it was a sound wave, what would happen to the pitch if the object is moving away from the observer?

the sound will become lower pitched

if its a sound wave, what would happen to the pitch if the object is moving towards the observer?

the sound will get higher pitched

what happens to the wavelength and frequency if the object is moving towards the observer?

the wave is 'squeezed' so the wavelength decreased (gets shorter) and the frequency increases

what happens to the wavelength and frequency if the object is moving away from the observer?

the waves will be stretched, increasing the wavelength and reducing the frequency